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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-16725] Incorrect character conversion between UTF-8 and UTF-16</title>
                <link>https://jira.mongodb.org/browse/SERVER-16725</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;The use of UTF-8 unicode characters in a database name will cause creation of directories with directoryperdb to fail.&lt;/p&gt;

&lt;p&gt;Because the BSON spec defines strings to be stored in UTF-8, strings in the &lt;br/&gt;
server are also UTF-8. Windows, however, uses UTF-16 for its implementation of &lt;br/&gt;
unicode, and as inputs for its APIs. This means that we must convert between our internally used 8 bit characters&lt;br/&gt;
and Windows 16 bit characters before API calls are made. For file operations, we do this in two ways. mongo::File is the first.&lt;br/&gt;
When open is called on a path, MultiByteToWideChar is called on the path, converting the UTF-8 encoded string to UTF-16.&lt;br/&gt;
The second is through boost::filesystem::path. This class uses C++&apos;s locale system. std::locale is an object which specifies&lt;br/&gt;
different properties which a localization might have. These properties are called facets. One such facet is the codecvt, which handles&lt;br/&gt;
conversion between different types of strings. The boost::filesystem::path instantiates a copy of the global std::locale, and overrides its&lt;br/&gt;
codecvt with a custom converter object. This locale is then saved globally for use in path operations.  When a path is created, or &lt;br/&gt;
appended to, the codecvt is used, if necessary, to convert the provided string into the operating system&apos;s default character format.&lt;br/&gt;
The original std::locale is left as is. Unfortunately, boost::filesystem&apos;s implementation of the codecvt, windows_file_codecvt, is incomplete.&lt;br/&gt;
It will set the 8 bit character&apos;s code page to either ANSII, or the OS&apos;s OEM codepage. This means the conversion will be invalid.&lt;/p&gt;

&lt;p&gt;Because two mechanisms are used, it appears that we are creating an incorrect directory name, using boost::filesystem::path, creating that incorrect directory, then attempting to create a file in the correct path. The directory in the file path will not exist, and file creation will fail.&lt;/p&gt;

&lt;p&gt;FileAllocator&apos;s makeTempFileName and run functions will need to be modified. makeTempFileName produces a path as a string. Though it uses boost::filesystem::path internally, it translates the path back into 8 bit characters when it converts to std::string. run then uses c_str on said std::string without any width conversion.&lt;/p&gt;

&lt;p&gt;A plausible solution to this might be to use boost&apos;s locale library to generate a new std::locale object with a correct codecvt, as per the&lt;br/&gt;
boost filesystem documentation here: &lt;a href=&quot;http://www.boost.org/doc/libs/1_51_0/libs/locale/doc/html/default_encoding_under_windows.html&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;http://www.boost.org/doc/libs/1_51_0/libs/locale/doc/html/default_encoding_under_windows.html&lt;/a&gt;&lt;/p&gt;</description>
                <environment></environment>
        <key id="177000">SERVER-16725</key>
            <summary>Incorrect character conversion between UTF-8 and UTF-16</summary>
                <type id="1" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14703&amp;avatarType=issuetype">Bug</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="mark.benvenuto@mongodb.com">Mark Benvenuto</assignee>
                                    <reporter username="spencer.jackson@mongodb.com">Spencer Jackson</reporter>
                        <labels>
                            <label>28qa</label>
                            <label>locale</label>
                            <label>utf-8</label>
                    </labels>
                <created>Mon, 5 Jan 2015 18:34:28 +0000</created>
                <updated>Mon, 8 Jan 2024 15:23:07 +0000</updated>
                            <resolved>Fri, 16 Sep 2016 18:47:50 +0000</resolved>
                                                    <fixVersion>3.3.14</fixVersion>
                                    <component>Internal Code</component>
                                        <votes>0</votes>
                                    <watches>9</watches>
                                                                                                                <comments>
                            <comment id="1386581" author="xgen-internal-githook" created="Fri, 16 Sep 2016 18:47:10 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;markbenvenuto&apos;, u&apos;name&apos;: u&apos;Mark Benvenuto&apos;, u&apos;email&apos;: u&apos;mark.benvenuto@mongodb.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-16725&quot; title=&quot;Incorrect character conversion between UTF-8 and UTF-16&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-16725&quot;&gt;&lt;del&gt;SERVER-16725&lt;/del&gt;&lt;/a&gt; Incorrect character conversion between UTF-8 and UTF-16&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/f0d958c747cfc42dd831eb2f088e963475c0ed54&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/f0d958c747cfc42dd831eb2f088e963475c0ed54&lt;/a&gt;&lt;/p&gt;</comment>
                    </comments>
                <issuelinks>
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                                            <outwardlinks description="depends on">
                                        <issuelink>
            <issuekey id="311912">WT-2863</issuekey>
        </issuelink>
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                                                        </issuelinktype>
                            <issuelinktype id="10010">
                    <name>Duplicate</name>
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                                        <issuelink>
            <issuekey id="232127">SERVER-20697</issuekey>
        </issuelink>
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                                        <issuelink>
            <issuekey id="33269">SERVER-5333</issuekey>
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                            <customfieldvalue>&lt;p&gt;On Windows, start a mongod with directoryperdb. Create a database with a single multibyte UTF-8 character as its name. Insert a document.&lt;/p&gt;</customfieldvalue>

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